a. i didn't get my tattoos to start conversations, i got them for me. if you're getting any kind of body modification for someone other than yourself, you're getting it for the wrong reasons. and i'd be willing to bet my tattoo in my av starts more conversations than your piercing, wherever it may be.
b. piercings almost ALWAYS leave some kind of scar behind. my grandpa had his ear pierced in the army almost 50 years ago, and you can still see where it was.
c. you honestly think getting a ten minute piercing(if that) is the same as sitting under a needle for 2 or sometimes even more hours?
and to the OP, what's the point in getting a 6 month tattoo? lol "I really like barbed wire, but only for now"